| ??? 12/02/08 22:52 Read: times |
#160522 - more information would be helpful Responding to: ???'s previous message |
What kind of power, 1000kV, 2 mV, 20 fW, 200GW, AC, DC, intermittent, steady state, tolerance? What message lengths? What bit rate? What kind of conductor? What kind of insulation? How well protected from the environment?
Here in the U.S. it's possible to do that, as witnessed by the telephone company. As mentioned already, that would be a good place to start. You could use a phase-modulated AC signal, with phase changes +/- 2%, or perhaps that wouldn't work, depending on what the above parameters are. RE |
| Topic | Author | Date |
| long distance communication | 01/01/70 00:00 | |
| TelCo? | 01/01/70 00:00 | |
| Contact ID? | 01/01/70 00:00 | |
| more information would be helpful | 01/01/70 00:00 | |
| Breif Explaination | 01/01/70 00:00 | |
| is there local power at the "field switches" ? | 01/01/70 00:00 | |
| INdustrial Data Comms Supplier | 01/01/70 00:00 | |
| In North America | 01/01/70 00:00 | |
| Another Industrial Data Comms Supplier | 01/01/70 00:00 | |
| Too brief | 01/01/70 00:00 | |
| re: | 01/01/70 00:00 | |
| Suggestion | 01/01/70 00:00 | |
| re:Andy Neil | 01/01/70 00:00 | |
| or with wifi | 01/01/70 00:00 | |
| Past Experience | 01/01/70 00:00 | |
| Serious warning | 01/01/70 00:00 | |
| with PLC or rs-485 | 01/01/70 00:00 | |
| SHM ,LHM | 01/01/70 00:00 | |
| It might interest you to know ... | 01/01/70 00:00 | |
| There are ways but, | 01/01/70 00:00 | |
| DC? ... over a 10 kM line? | 01/01/70 00:00 | |
| I might suggest that you consider... | 01/01/70 00:00 | |
HART | 01/01/70 00:00 |